storage vs keeping

storage and keeping both are nouns.

Word	Noun	Adjective	Verb	Adverb
storage	Yes	No	No	No
keeping	Yes	No	No	No

As nouns, keeping is a hypernym of storage; that is, keeping is a word with a broader meaning than storage:

Other hypernyms of storage include holding, retention.

storage (noun)	keeping (noun)
the commercial enterprise of storing goods and materials	the responsibility of a guardian or keeper
the act of storing something	conformity or harmony
depositing in a warehouse	the act of retaining something
a depository for goods
an electronic memory device
(computer science) the process of storing information in a computer memory or on a magnetic tape or disk